Why would you want to use that when there are several dynamic IP tools built in to e-smith already? At least 2 of them are free. They are listed in Appendix B in the e-smith user guide.
" e-smith, inc. has tested four dynamic DNS services, of which two are free services and two are commercial services: yi.org (free), dyndns.com (commercial), tzo.com (commercial) and dyndns.org (free). For simplicity, we have preprogrammed the e-smith server and gateway to work with these services (including pre-installing their client software). If you have arranged dynamic IP address assignment from your ISP and you wish to use one of these services, all you need to do is visit the appropriate web site to sign up for service, and enable that particular function in the e-smith console. In pre-configuring the e-smith server and gateway for this particular service, we in no way interfere with nor prevent you from using another dynamic DNS service if you wish. To do so, however, would require some customized configuration on your part."
Why spend time fiddling when e-smith has done the work for you. (Unless you like to fiddle with things like I do. LOL!)